1) copper + oxygen --> ... + hydrogen a) copper oxide b) copper hydroxide 2) Magnesium + oxygen --> magnesium oxide + hydrogen. What is the reactant? a) Magnesium and oxygen b) Magnesium oxide + hydrogen 3) Which one is the most reactive? a) iron b) copper c) magnesium d) lithium 4) Which one is the least reactive? a) copper b) gold c) magnesium d) potassium 5) sodium + hydrochloric acid --> sodium chloride + ... a) water b) salt c) hydrogen d) sodium oxide 6) What happen when silver react with water? a) silver oxide b) produce hydrogen c) react vigorously d) no reaction 7) The more reactive Group 1 metals react ... with cold water a) slowly b) vigorously c) no reaction 8) when the surface of a metal turns dull in the air, we say that the metal is .... a) reactive b) tarnishes c) oxidation d) shiny 9) Aluminium + ... --> aluminium oxide a) water b) oxygen c) acid d) alkali 10) metal + oxygen --> ... a) metal oxide b) metal hydroxide

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